Having one's legs crossing each other, whether one is sitting, standing or lying(please tag as appropriate).
If the legs are crossed at the ankles, use crossed ankles instead.
For the sitting style where the legs cross at the ankles "pretzel"-style (also known as agura, 胡坐, in Japanese, or tailor's style in several European languages), use indian style.
See also
figure four sitting (a character is sitting with their legs crossed with one calf or ankle resting on the other knee or thigh).
